棉 花 学 报    Cotton Science  2007，19(1)：8-12

Studies on Photosynthetic Characteristics Yield and Quality of Sparse Planting Cotton-retaining-leafy-shoots
LI Ling-li¹，MA Zong-bin¹，FANG Wei-ping²，XIE De-yi²，ZHANG Dong-lin³，TAI Guo-qin¹
(1. College of Agronomy，Henan Agricultural University，Zhengzhou 450002，China；2. Cotton and Oil Crop Research Institute，Henan Academy of Agricultural Sciences，Zhengzhou 450002，China；3. Kaifeng County Cotton Production Office，Kaifeng 457100，China)

Abstract：As compared with cotton-removing-leafy-shoot of conventional cultivation with 3.75×10⁴plants per hectare，the photosynthetic characteristics，the yield & quality of cotton-retaining-leafy-shoot of simplify cultivation with2.25×10⁴plants per hectare was studied under field condition. The results showed that simplify-cultivation's ventilation and transmitting light rate between the row were inferior ，the yield percent before frost was lower，the photosynthetic efficiency of leaves in middle-below layer of canopy and non-photochemical quenching coefficient (NPQ)of main stem leaves reduced obviously ；fibre strength was reduced by 5.2%.But the contents of chlorophyll，PSⅡ activity(F_V/F_O)，actual photochemical efficiency of PSⅡ(Ф_PSⅡ)，stomata conductance(G_s)，photochemical quenching coefficient (qP)of main stem leaves，and cotton yield，and length，micronaire value，uniformity，maturity of cotton fibres were no obviously difference between the two treatments.
Key words：cotton；sparse planting；retaining leafy shoot；photosynthetic characteristics；yield； quality   [Full Text，1975KB]